Merge github.com:grpc/grpc into error

BUILD

Makefile

binding.gyp

build.yaml

config.m4

gRPC.podspec

grpc.def

grpc.gemspec

include/grpc++/impl/codegen/completion_queue.h

include/grpc++/server_builder.h

include/grpc/grpc.h

package.xml

...core/ext/transport/chttp2/server/insecure/server_chttp2.c

...ext/transport/chttp2/server/secure/server_secure_chttp2.c

src/core/lib/iomgr/ev_poll_and_epoll_posix.c

src/core/lib/iomgr/ev_poll_and_epoll_posix.h

src/core/lib/iomgr/ev_poll_posix.c

src/core/lib/iomgr/ev_posix.c

src/core/lib/iomgr/ev_posix.h

src/core/lib/iomgr/tcp_server.h